Before retiring from service work I had done factory authorized repairs for Motorola, Kenwood, Icom, Yeasu and others. The Icom PW1 power supply was one of the only times I can remember a manufacturer telling me that no parts were available to an authorized service center on a current production model. I've been able to order parts from the other manufacturers sometimes as late as 10 years after the final production run.
I understand that with most Chinese consumer electronics today, parts are ordered for a run and they don't stock most items long if at all. For the most part the top three amateur manufacturers build in Japan and have maintained a good parts department. The PW1 power supply is a totally different animal.
This particular problem became the topic at a dinner conversation with the man in charge of Icom's sales in the USA. Our argument was as an authorized service center we expect access to current parts. Otherwise what's the point in troubleshooting for a particular manufacturer? He was apologetic because the only thing he could offer was a complete power supply for $2,500 and not a single part inside the enclosure.
He did point out that this was not typical for Icom and that the 50 volt power supply used in the PW1 was not made by them and that Icom had made no arrangement to purchase individual parts. When a $5000 amp is just out of warranty and blows up a $40 part, who's going to be happy with a $2,500 repair before labor?
I admit to being a bit critical of Icom over this and can say the PW1 is an awesome amp. The power supply is not lacking for the eight MRF150 FET's. It's just not immune to any AC spikes. It's also likely the days of being able to order parts on a 10 year old model are gone or will be soon. In the past ham equipment has been resistant of this trend.